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    Volume 50, Issue 1 (May 2021)

    Examining Different Alternatives to Delta Tc (ΔTc) as a Parameter to Screen Asphalt Binders

    (Received 22 July 2020; accepted 19 March 2021)

    Published Online: 14 May 2021

    CODEN: JTEVAB

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    Abstract

    The Superpave performance grading (or PG) framework or a variation of this framework is often used as a purchase specification in the United States and as a tool to evaluate the expected performance of modified and unmodified asphalt binders in many countries around the world. During the last decade and in response to changes in the use of modified binders and extenders, several modifications and improvements have been proposed and implemented to improve this framework. One such modification is the use of the ΔTc parameter, which is based on the stiffness and m-value of an asphalt binder measured at low temperatures, as a metric to screen asphalt binders that contain higher concentrations of potentially deleterious refining products or as an indicator for susceptibility to premature cracking. The estimation of this parameter requires the determination of the true low temperature grade of the asphalt binder based on measurements carried out using a bending beam rheometer at multiple temperatures. This study explores the expected variability associated with the determination of this parameter as well as alternative metrics that can be more easily used on a routine basis as a quality control tool to screen binders with a low ΔTc value. Based on the evaluation of nearly 200 binders from several different suppliers in and around the state of Texas, this study shows that a combined use of stiffness and m-value measured at the low grade test temperature of the asphalt binder can be used as an effective specification/screening tool to detect binders that result in a very low value of ΔTc.

    Author Information:

    Komaragiri, Satyavati
    Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, Austin, Texas

    Filonzi, Angelo
    Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, Austin, Texas

    Guevara, Eliud
    Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, Austin, Texas

    Hazlett, Darren
    Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, Austin, Texas

    Mahmoud, Enad
    Materials and Test Division, Texas Department of Transportation, Austin, Texas

    Bhasin, Amit
    Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, Austin, Texas


    Stock #: JTE20200459

    ISSN:0090-3973

    DOI: 10.1520/JTE20200459

    Author
    Title Examining Different Alternatives to Delta Tc (ΔTc) as a Parameter to Screen Asphalt Binders
    Symposium ,
    Committee D04